- Participants will receive the study drug (IPI-504) twice weekly for two weeks followed by 10 days without study treatment. This 3-week period is called a cycle. Participants will receive a total of 4 doses per cycle. On the days the participant receives study drug, they will come to the clinic and be given the IPI-504 by being. Participants will continue to receive study drug for additional cycles as long as they are benefiting from it and do not experience any severe side effects.